Clickmenow.

For the tl:dr crowd:

The Open Patent Non-Assertion (OPN) Pledge essentially states that Google is willing to share their patents free of charge and without fear of legal action unless someone steps on their toes first.

The big caveat here is that Google is pledging not to sue anyone who uses its MapReduce patents for Free or Open Source Software. Google is defining Free or Open Source software as any software that meets the Open Source Initiative's "Open Source Definition," as well as any version of the Free Software Foundation's "Free Software Definition." Still, Google iterates that the OPN Pledge isn't limited to a specific project or open-source copyright — as long as the project meets the FSF or OSI's definition for Free Software or Open Source Software, it's protected by the OPN Pledge.

In short, while commercial applications cannot capitalize on this (at least not directly), with this pledge Google at least makes a conscious effort to be partial to developers on all platforms. While I can't truly appreciate this personally as I'm not part of the open source crowd, it seems to me that this is as big a bone a corporation can throw independent developers without shooting themselves in the foot.

Unless the pledge is bogus (oh, those repercussions should be fun to watch), I should say this could affect (if not shape) the demeanor of patent holders in general (anyone recall the luls around MP3 over the past two decades?), which might spread out the cloud of mindless paranoia that currently hovers over the software (and hardware)* landscape.

* I'm looking at you, Apple

Then again, I'm no patent expert and have never needed to deal with any directly. What are your thoughts?

To me this was a non-announcement. It is business as usual.

It is not groups like Apple or Google or Amazon or Microsoft that the little guys need to worry about.

Non-Practicing Entities (NPEs) are the ones you need to worry about. They are generally the patent trolls. They get the patent and rather than using it to build something, they use the patent to sue people.

When the big companies get the patents they usually use the patents defensively, which is what they described in their non-binding pledge. That's exactly what you wrote by "step on their toes first".

Of course, defensive is in the eye of the beholder. When a company holds thousands or even hundreds of thousands of patents, if the company doesn't like you they probably have something in their patent portfolio they can accuse you of violating.

It is much the same with law enforcement: they'll generally ignore you if you don't "step on their toes first". But the moment you offend a cop or the AG's office, they have a massive portfolio of laws they can accuse you of violating.

You could potentially make an open-source library that implements MapReduce and then link to that library from your game.

EDIT: Just to be clear, I kind of doubt that Google will actually allow you to do this, but it's not totally obvious to me.

MIT is open source!

That'd be an interesting legal scenario. They give permission to a project that is LGPL licensed which is then used by Microsoft.

I'm more curious about some upstart taking a Google patent (if you read the article, MapReduce is far from being the only one they've pledged or plan to pledge not to take legal action over) and creating a directly competing open source product.

The MP3 example I brought was quite intentional: the suing and threatening aura that surrounded the format became almost hilarious over the years, but the bottom line was still that MP3 was a closed format. Period. Imagine someone writing a Foobar2000 (which is not only arguably the slickest music player out there, but also open source) and essentially blowing up the whole licensing scheme. Back in the day they would've been sued, forced to become proprietary (and purchase the right to use the format) or shut down, no questions asked (see what happened to WinAMP). Conversely, something like this wouldn't even have made the news.

So I don't quite agree that this is a non-announcement.

What I do think will be much more likely is that since they're not pledging on all of their patents, the ones they will pledge not to take legal action over, will either be lesser/more useless patents or ones that can't hurt them (but/or have a greater chance of hurting their competition more at then end of the day).

I just found this text: http://www.fosspatents.com/2013/03/googles-promise-not-to-assert-10.html